File:Spark testing 1.png

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DescriptionSpark testing 1.png	English: Diagram of sparks for spark testing various types of steel. Key: (A) High-carbon steel (B) Manganese steel (C) Tungsten steel (D) Molybdenum steel
Date	15 May 2009
Source	Oberg, Erik; Jones, Franklin Day (1918), Iron and Steel (1st ed.), The Industrial Press.
Author	Wizard191
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Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	22:40, 15 May 2009		630 × 406 (156 KB)	Wizard191 (talk \| contribs)	{{Information \|Description={{en\|1=Diagram of sparks for spark testing various types of steel. Key: (A) High-carbon steel (B) Manganese steel (C) Tungsten steel (D) Molybdenum steel}} \|Source=Oberg, Erik; Jones, Franklin Day (1918), [http://books.google.c

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